ATK HP57 Chevy 350 Base Engine 1987-1991 Corvette




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This engine is a performance replacement for 87-91 Corvettes, smooth idle great daily driver.

Engine Specifications:
• HP: 289
• TQ: 370
• Block: OE roller block 4 bolt main 1pc seal 1996-2000
• Bore/Stroke: 4.040” x 3.480”
• Displacement: 350CI
• Crankshaft: OE Reground external balance rear of the crank/internal balance front of the crank
• Rods: OE powder metal 5.7”
• Pistons: Hypereutectic 10:1 Compression
• Rings: Moly
• Camshaft: Hyd. Roller
• Cam Specs: 207/214 @50 .411in/.428ex 112LSA
• Timing Chain: Double Roller
• Cylinder Heads: Edelbrock performer aluminum 60cc/165cc 2.02/1.60
• Rocker Arms: Stamped steel rockers 1.6 ratio
• Oil Pan: Rear sump 5qt (Standard SBC oil pan, may not fit some Corvette’s. If not, you must use your original oil pan)
• Oil Pump: Melling STD Volume

Recommended Components:
• Flexplate/Flywheel: Externally Balanced – Pioneer #FRA-159
• Balancer: Internally Balanced – PowerBond 6.75” #PB2221-N
• Intake Manifold: Stock TPI Intake
• Distributor: Stock Distributor (Iron Gear)
• Water Pump: Stock
• Fuel Pump: Stock
• Spark Plugs: Autolite #3926
• Spark Plug Wires: Stock

Engine Info:
• Oil: Conventional / Non Synthetic 10W30
• Oil Filter: Wix or K&N
• Timing: 34-36 Degrees (set with ECM)
• Spark Plug Gap: .035”
• Firing Order: 18436572
• Octane: 91+
• Stall Converter: Stock
• Exhaust: 1 5/8 Headers


Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. . ATK reserves the right to substitute parts used in engines if necessary.


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